Int 13 Fn 49  - Ibm/ms Int 13 Extensions - Extended Media Change           [d]

   AH = 49h
   DL = drive number

Return: CF clear if media has not changed
       AH = 00h
   CF set if media may have changed
       AH = 06h (see #0166)

Note:  unlike AH=16h, any drive number may be specified

See Also: AH=16h,AH=41h"INT 13 Ext",AH=46h